package middleware

import (
	"strings"

	"github.com/gin-gonic/gin"

	"github.com/sundynix/pets-be/pkg/errcode"
	appjwt "github.com/sundynix/pets-be/pkg/jwt"
	"github.com/sundynix/pets-be/pkg/response"
)

// gin.Context 中存放身份的 key
const (
	CtxUserID  = "userID"
	CtxAdminID = "adminID"
	CtxName    = "name"
)

func bearer(c *gin.Context) string {
	h := c.GetHeader("Authorization")
	if h == "" {
		return ""
	}
	if strings.HasPrefix(h, "Bearer ") {
		return strings.TrimPrefix(h, "Bearer ")
	}
	return h
}

// AuthUser 小程序用户鉴权
func AuthUser(jm *appjwt.Manager) gin.HandlerFunc {
	return func(c *gin.Context) {
		claims, err := jm.Parse(bearer(c))
		if err != nil || claims.Kind != appjwt.KindUser {
			response.Abort(c, errcode.ErrUnauthized, "")
			return
		}
		c.Set(CtxUserID, claims.ID)
		c.Set(CtxName, claims.Name)
		c.Next()
	}
}

// AuthAdmin 后台管理员鉴权
func AuthAdmin(jm *appjwt.Manager) gin.HandlerFunc {
	return func(c *gin.Context) {
		claims, err := jm.Parse(bearer(c))
		if err != nil || claims.Kind != appjwt.KindAdmin {
			response.Abort(c, errcode.ErrUnauthized, "")
			return
		}
		c.Set(CtxAdminID, claims.ID)
		c.Set(CtxName, claims.Name)
		c.Next()
	}
}

// UserID 从上下文取当前用户 ID
func UserID(c *gin.Context) uint {
	if v, ok := c.Get(CtxUserID); ok {
		if id, ok := v.(uint); ok {
			return id
		}
	}
	return 0
}

// AdminID 从上下文取当前管理员 ID
func AdminID(c *gin.Context) uint {
	if v, ok := c.Get(CtxAdminID); ok {
		if id, ok := v.(uint); ok {
			return id
		}
	}
	return 0
}